CVE-2024-52815
MEDIUM5.3EPSS 0.35%Synapse allows a a malformed invite to break the invitee's `/sync`
Published: 12/3/2024Modified: 5/20/2026
Description
Synapse is an open-source Matrix homeserver. Synapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync functionality. Synapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.
Affected packages (2)
- Debian/matrix-synapsefrom 0, < 1.121.0-1
- PyPI/matrix-synapsefrom 0, < 1.120.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |